The sun will go dark on Aug. 21, 2017, when the moon passes in front of the sun and blocks solar rays in a swath across Missouri's midsection.

According to Missouri State parks, there are 42 parks and historic sites within the narrow path of the total eclipse. Of those, 19 allow overnight camping, and park officials are allowing people to reserve campsites at those locations earlier than usual, ahead of the big astronomical event.

Through Nov. 25, guests will be able to make camping reservations for the weekend of the eclipse.

“It’s been nearly 150 years since a total solar eclipse took place in the Show-Me State and we recognize that many Missourians are already planning a memorable way to experience the big event,” said Bill Bryan, director of Missouri State Parks. “Guests can make advance reservations now to guarantee that they will have the chance to top off a fun weekend of camping and exploring the outdoors by viewing this extraordinary and rare astronomical event in a state park.”

Camping reservations are typically available six months before the first night of a stay. This special reservation window will allow guests to begin planning their visits now.

Of the 42 state parks and historic sites that will be within the path of the total eclipse, 19 parks offer camping.

These parks are Big Lake State Park, Lewis and Clark State Park, Weston Bend State Park, Watkins Mill State Park and State Historic Site, Wallace State Park, Knob Noster State Park, Van Meter State Park, Finger Lakes State Park, Arrow Rock State Historic Site, Graham Cave State Park, Robertsville State Park, Meramec State Park, Onondaga State Park, St. Joe State Park, Hawn State Park, St. Francois State Park, Washington State Park, Dr. Edmund A. Babler Memorial, and Trail of Tears State Park. Reservations for this event require a three-night stay from Aug. 18 through Aug. 21.

To make reservations, visit mostateparks.com or call 877-422-6766 from 7 a.m. to 7 p.m. CT, seven days a week.